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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cc226c588d3ca945c6b654f687bec86fabe3f1e4c330d0a65255d9233964a8' 
  AND token = 'HdzLwYuNoKAlcnZi+mq6NIYmaAnrqtxt3soF/G3IR6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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