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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015b035b3d2bbae6f577a6b176815f3b1b0d8a0e2532bb283004954e2b3798f6' 
  AND token = '4sFiUn2JGBoCRa3bzwod6AceRNMv/pEUU9VdvQY4kJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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