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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9a5fdb6ab7e432eb8cb9b888351d2e1a7dfb80ad3b8e37eb7e538d4db243a1' 
  AND token = 'goctu901mQl+vgp9BtsmpfpkkLC5cjDVxztFrvdOmms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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