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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40c510a67d8ae3d617f90947974e3d843e7c67c3f8b7c43edb801170371363c' 
  AND token = 'c3VNBEq18rTW8PKwTAzALm/4w4efI3WAec/mFVjol1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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