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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67760a72bd970d630202e72e9ba3c0e5e3627661b10c54f43d6043cd9093a9c4' 
  AND token = '7mWfr3szsI+2lnGFQLguATJ4HnvUiMNm9B/6fapX3EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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