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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0edcf639a73fac3da29655f8dead6f91e9c453ba818c0e4465bf673eb685ca' 
  AND token = 'd7g+WOnVFHNkWygNSmDLHT4slhyrpRWFclBOzMfVVsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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