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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d26ba7a4e7d800eb1ee659c37f1d097cb82d72458408143e7bf8812045a6feb' 
  AND token = 'VoE2LdIdOqtQenfCLfoop8SswUGlRc5WsCt9GLo3jKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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