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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c865b37635c061f7ec557c151528ffa147c2a554534d5488de7b8907d9a19f29' 
  AND token = 'ecL28bIdwk21j5g1S8OGBZk1AXzApqMu09kovVuFWkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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