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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5355d4fbc6a95187f7a15b533adfadb903917d6a654a3f6d752318b765ee0068' 
  AND token = '4ugl5x4i9bbbgCZLGl66l7vg+Fy42cFnx611TpjcfNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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