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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634c59c915e4b87039239f7958c1ed1bba35654c96aa95f0c9eb5f3302fcfb7e' 
  AND token = 'cRIydkfIJ9SUGt/DKxDuRcfM7ZvVSH4oGrJflBF3wE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}