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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a28959d52bb8d5285322d859188853e9095a8a70c153fd0f6566a79242888f' 
  AND token = 'f/B8DECFtm0xvSp3RHEDLBh76j+Q7OXZ68dh/UUFCNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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