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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b18aa0f6d04bb9971973a5b04af997ddb4bf3cd20afcc35d3ee962cc7a9c0a4' 
  AND token = 'U+to4mE+AupTDle2+erlahZ1RMO4S5k+zV0v/G8h3wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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