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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ae0b8233e857fdb0967fd90e0bbaa6e1fe639a9e887d17c4d6cb5a1b879335' 
  AND token = 'r2GwkJO9im2ujV7fHP/ULRER+RYpewrfgPZ8erEc5uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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