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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c4c56c6497d4b15da4c9309156335ee657f76ebff97e11b20cff04887aaf53' 
  AND token = '3+/wdpc/Q46yDz266gq8C8QeIkJu8z5gVhH5DRpCWxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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