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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a42899179e7b23e2a3b5d4576334d0b127962cc65515a284af9874d4a03c670' 
  AND token = 'SPphqDAvktCNQwoii+PyH5w5EsLlPnkac1WA+GTs6V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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