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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc906b8851199b7941597c3f16bb5dd28df7618e8e24631babe5cea59bc4cc4' 
  AND token = 'cEJ5YqH4oaT7Vbo6HqhvuSImQ8zr0qdvz5amwwMBE3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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