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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855f16ae10aaac5f799b8661e64c7bc07ca5820329df8d10d449e447e30f53c0' 
  AND token = '7OvPEf0IDtJBasdJnoOIWW9ZcqqFhQIDXmp6iJV/J9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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