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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea95b1eb353f0720d80088fabc621b8e5b19a182d264bdfe39a830d206e7b8d0' 
  AND token = '1lFAHqmmfbsspYdrd/z/O2BwWvgVqbOz4WcnJGAcs88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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