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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efe8c1f4847c8d4dd08962a1a88d5bb7a0ed236b41ef037c95b4f519c9528a9' 
  AND token = 'dMAzRbS8ZMf6JFuLRZqWn4u8/ZOPvccBVw2ly9y9OQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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