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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704dd574c9127a3644af2e26ddd09e993667b3f070a84d703f62d7183cd11f05' 
  AND token = '6vhxMMnp7HGVQQ00H12BGVaGX7u/zUVZ16O0KBSyfys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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