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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9aee76f56c19ba7fe4bf4954f91aab8445e2a16d3308594cbcddacc01422074' 
  AND token = 'z7WlCpaQFllwInuNjHa6mryRV8ytYRXu2fIm4+rp1Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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