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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b812c715901f8ce23de00613d4116fda6a5cf569168fac30304209487ccb687' 
  AND token = 'WTAKm+rzC7DVJNmeyaYfap4tGs0NZnRY63Q61/AmRgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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