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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7c7a276079f141874439b368b218b55f6b7ae51746569770522a3d1738374e' 
  AND token = 'aUiKNyF+w+KfcfrMM2KLpQnEODiadsZrI3J8lb9R8KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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