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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8182b27634cf8bf8530fc2c749eee204025f600c6fca8c19d3d75d9696709914' 
  AND token = 'MnOliW9J7XoI9/YpvZf18I0Ffjr4havp70/gGLZfz2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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