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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dabba22713fd6ad9719cc3621aafd1dc32672749ff55e5e28778d897cc00d6b' 
  AND token = '7PlnlLeADRFAsP4LfO0BA031esJWwVu6Tt+TnnXeSRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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