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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6f7640fd90e9c5bd420f88cff9fd341c006d6d89a491aee5b9cffc46a8d767' 
  AND token = 'gwW4XARfP781VXSWGv6pFZ0iTiG/FjR1h61Rq6azjk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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