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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5ce33ace1caed2abf91bea396f5da79ed2ab1448dec98ccbdd95e2fcd92948' 
  AND token = 'InvZaLrGYKXdyQX2CXfX0wllB4wJn7toXovbDtCf6Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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