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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0432e276ff1b9aa7e7ae66a64ac289d580f878ccb20a23c5511664d343611737' 
  AND token = '/ML3zDtQHpG1GFcDlaesb/+aVQ6WVTwKte/2hXNekQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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