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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5aba50006294a90f70328d76b562f6ca87f6c913b546746f4ee98116b244c1' 
  AND token = 'OCyv8O3RKzOucwPlmIor8kjC7rtFrxQAyIPkMeLwr2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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