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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd975137927844a81b4986a4b788e44c74673242d2d604c91e1ef6210bf860d10' 
  AND token = 'M4S6+oJTeAQI7Q/yPSD9gUIZ/P8HJHOMfLHRfwAuRaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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