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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93cc2bb798dc521b87c5ba3a7e0f992057960a6b9cf036fad55833bcb750568' 
  AND token = 'CPtuvUQLCMwe0jSiRkv1uNNG2WwldL9V73NX/lwwvDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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