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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f7967d24a2e0282c45b30f02cfffeaa3b4661f21cc09b1a8369f4c17f66c13' 
  AND token = 'BKIxbbOSnavkBcGm6vTjvYUz0w9VIci1WqfcgeHIvyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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