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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e94bbadc02f3aeb076ef95928bf27b206c2c74d3a5c502f808257ad2c4fe2c' 
  AND token = 'I4mO6cUlpvWG56XRI1C8f/6Vow8RB5U7MBHVic3334g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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