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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8ff5eda31867c2bcf7f8d0538d9c1cdce8b76aab7caa5ad79d3666a0cb6103' 
  AND token = 'GLDEK1H5BCnxbuyVoTfa4VQnHyA/WnISmW6KpnnDFWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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