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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30da4cacf64f0324e0f7b3f59d95e127e0c9e92e739b04ec26b3fd78282d7846' 
  AND token = 'Nt1DM7ci9EIVwBcdLGd+Pqp8ppWmGFHOptVBmCleYVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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