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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53acae6d6537b1c10b0988014ef24e3fbf98477fa7276986e7ab8675db402476' 
  AND token = 'dyJa/o9of0E1iZelJAsTliGwWA/G6kdtTdLFaYeyo2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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