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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50cb2ee25b60b0cb165b83df185d1c186f25ac3bfa7b3ce97603929129d789ac' 
  AND token = 'etdyXdXcfyHM6UjrTPIY/+gn17v2ccDjI7w8j/R+Bc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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