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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7f02c9cc2b2c399286510a4ad6ea81deb50a94770447866039c8cf33fbbf6e' 
  AND token = 'k2L3/eR8dimqi9T4CHoltvS7etZTzBXVwAyIJDZs0fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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