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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034bc050567774beddaf725abbae53dce618ad086f709540dfc423e07d658f46' 
  AND token = 'iDnDsCaLzOsWyyAxZbP0wn49RA718SfM/YC47e4oFBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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