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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f588b8da2ff93120ae6c9728f49d2c75d3a50253f0391a32f9701519daf1ca73' 
  AND token = '6S7ih75xiGlA2y73DIDoGnw6fx7aKV20gIqrnvoYzS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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