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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47fb397ac5cdda69012052aa2a2f6416f4d467d67d2dc7a84c05405a432e638' 
  AND token = 'zj8Ptt475rYT1l6zh+Bmt1bvSDaW2JO/ZcL1HPtut1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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