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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b0b76bc043622b1fb7836d2b8c92ccef5cc5d1bd3b92f97e46f8b3ac30db93' 
  AND token = '5Y7wW6OU0v05pT1kM0ow5Db0B1oMG0K+HlhxQiD6uv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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