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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d36342a5b1ba1d5d4b90144a855de4ad31f60b9880338b7e54114126498298' 
  AND token = 'iWX5a5iaeZjQ3RL/CP3GoslS/fzrObG1/mfJX/OF7uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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