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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138e55ffaca9f182b7f839fa79051281dd98399870af34baa1dbaf878d753c92' 
  AND token = '4/r27X3u1VatliMgwNyrHmuSHLZGJ0yR2HI1VNvLGfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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