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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035d254ff8309abacac380a2ebcf89e71d617b6bfd2c26b2df0fc54ac55ac7ec' 
  AND token = 'x78tP4v6NV2cLJDwnaneUDeW0S+VJ5K7WFr9icrS8Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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