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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b904b95aa45c37c1d9ded50f2c9ef69cd2f9d40f2c6ea5db57e8c25540e1148' 
  AND token = 'n9OPaDU/wWXs0pg7bbvQO1JRd8wTd6kSqVzuTRTyVCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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