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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dfb1cab5b17172488ca0570bd01b26f60c97de8ba05dd53e2c3023a9760cdf' 
  AND token = 'WOjldpZPEBbG5jIcMKzTNkZEI+y1uRUCVjSx6EytaEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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