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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c50f748237716f0c2262d2e218d86221ad50a075fd529cb8cee76ef1b59e76c' 
  AND token = 'p+iHMi4GiEPmUB/niApgp6LUxAwAyIntlqJrSRLR2k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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