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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7a62920a1e70dfd8f366bb3a3ea2726252936e8117ba915973dcc3f50001cc' 
  AND token = 'gRkpSkXcfj4eyzjUuqouWWzWhE7g+n39fRbZWW+Y+4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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