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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778ba83f056444f0b9ea0a8c9bb0d38881e692d19bfa65df217b191b2db16b73' 
  AND token = 'urn2NDdlX0rCPzbTSW7Ub72PZAIkx1pN5xDhgDoJNRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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