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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d816c38fa72f778474b6e7265bee234480c301c1aebe0f9842c3fa19e767e9' 
  AND token = 'ElOJXxpSbJA0qYGuVu4wgbt6V6n1SUoQjUa8V5aKhRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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