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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d4c8f634a85725c9728b9038b13887020f99a7baa0628a16bfbf4d1e7df73e' 
  AND token = 'JgsYfH5YrwxoEXvBJltnHF6ZmERknOtWp0Y9BpYYOlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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