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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb494a2aae396f2ff3130dd1fc034abf855488c5459ca711b021b5c86dc5a2c' 
  AND token = 'FmWwCQgG0hQbQDr1Y8Tb3sQbrTJtUvt1+vPJYJ2ujIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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