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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4936f415a3309e2eeb37147bfd3ca63bdab6a340270f86fc9b91d68b79e62e1' 
  AND token = 'BI9VeIJSENlnk/eOdy5SQ18mCrY1eNPEXTUA4rtaVNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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