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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb23f9203ee1e7a240225ad47267238d2491519a15c951520b6ad76d27626ab' 
  AND token = 'OE7yPxHajU1SeBslNWu1JItwFoJcdaghJCL5+6dSBLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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