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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687268ec6569da76c086e974a47434613e74cee2b37fb938ef4f3c739fbb5d95' 
  AND token = 'Vv7lV9oJnaVmHC2m2EVHC9gLryKeGUjBHwOs2dfxJvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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