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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c939e154d52203dea0f8a8ae5e65ec2bf51be01826657fc70637eb5eebca19d0' 
  AND token = 'LAYeCucEb1vgkTo0L/rTLsSH6fhETqJuizKhiQl8Pns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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