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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a5e31d18cf26bc9bd3f0e174cb06ac9cd2d50911c785eb52f8cd3de64b9d9e' 
  AND token = '1h0/mTaH+aJyjVW3tmT8TgDgSazi70bqkOF7B8du6Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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