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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba9bd6f603e07300e13c82d15915a50253cd57d21520ac2e4f631a021c025c0' 
  AND token = 'R+2a0sb6yyPz0labUL7AwRt9gnbTCBibfFMMQeQe0VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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