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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe40fb1ba8cb420fa24b21de71419abfe2a2df599f6b6b32c9fef596cd367ddf' 
  AND token = '2YlgNXaZ5OVHXKAoEeS2YZOrEf8ge1u4DV/1nNbTAEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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