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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95291172dd19813394b465f0541676c016ca1bed27d51d45dc3e5f43fafb5c2b' 
  AND token = 'o1vZPlX/5PtNdy8oZgTAEcgER9lyoOhPtSYw+jFq0sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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